Insulator-support.



C. L. PEIRCE, JR.

INSULATOR SUPPORT.

APPLICATION FILED MAY 4. 1914.

1,202,418. Patented Oct. 24,1916.

INVENTOR. I 04% Km M 7% uiu wfzq A T'TOR NE YS.

UNITED STATES ATENT CHARLES L. PEIRCE, 5B,, OF PITTSBURGH, PENNSYLVANIA,ASSIGNOR OF ONE-HALF TO HUBBARD &. CO., OF PITTSBURGH, PENNSYLVANIA, ACORPORATION"QF Z?EI I1 I- SYLVANIA.

1,202,6LL6a Specification of Letters Patent.

Patented Oct. 24, 1916.

Application filed May 4, 1914. Serial No. 836,118.

'1 '0 all 7//L077Z it may concern I Be it known that 1, CHARLES L.PEIRCE, Jr., a citizen of the United States, and a res dent ofPittsburgh, in the county of Allegheny and State of Pennsylvania, haveinvented certain new and useful Improvements in lnsulator-Supports, ofwhich the following is a specification.

My invention relates to insulator supports and particularly to improvedinsulator supporting pins.

lVhere insulator supporting pins are subjected to heavy strains theytend to give or bend at some point between the cross arm and theinsulator supporting end. ll'here the pins are of wood orsolid metal thesection between the cross arm and 'nsulator supporting end musttherefore be made much heavier. Metal pins for heavy work arethcreforevery heavy, which of course, involves greater cost of material,and greater expense in the manufacture, handling and shipping thereof.Such solid pins are usually secured to a cross arm or other support byextending their shanks through vertical 'holes in the arm or support,this bringing the plane of vertical strain and downward pressure 011 theinsulators outside of the supporting plane of the cross arm on the pole.'In other words, the plane of the service weight on the pins is notcoincident with the plane of support of the cross arm on the pole.

The general purpose of my invention is therefore to overcome all theabove objections and among the important objects of the invention are toproduce a pin bent up from a length of stock metal bar into such shapethat the strength of the resulting pin at any section is proportionateto the strain to which that section will be subjected when in service;to produce such shape and form that the pin can be readily secured inposition against the inner face of'a cross arm in order to bring thevertical service pressure on the pins in the vertical supporting planeof the cross arm on the pole; to pro vide improved formation at theupper end of the pin which will adapt it better for receiving aninsulator or an insulator receiving thimble; and to produce a pin whichis particularly adaptable for use in connection .with metalliccross-arms or other structures.

be clearly understood by reference to the accompanying drawings inWhich-- Figure 1 is a front elevational View of a pin and a portion of asupport on which the pin is mounted, and showing also a thimble, partlyin section, applied to the upper end of the pin, and Fig. 2 is a sideeievational view of the pin and its support. I

The pin shown is formed up from a length of channel bar, althoughcommercial bar of other cross section may be used. A suitable length ofthe bar is bent at 5 midway its ends to bring the two halves thereoftoward each other into parallelism. The lower sections it anchb of thehalves, are not brought together but are left separated to leave alongitudinal slot 0 between them. The halves are further bent at d and etobring the sections 7 and 1 above the slot against each other. As thebar is bent with the flanges 6 and 7 on the outside the webs ofsections}' and y will be brought back to back so that the resultingsection will be of I I-beam, form. A t'ter thus bending the bar thesectionsf and 1 are securely fastened together by upper and lower rivets8 and 9. The slot 0 is of suliieient width for each pin to receive boltsor fastening means of necessary size to secure the pin to the support.In the drawings the pin isshown secured to a metallic cross arm 10 inthe form of an angle bar, and a. strap 11 is provided for securing thepin to the arm. the strap ends termii ii threaded studs 12 and 13 forpassing through the upper and lower ends respectively of the slot 0,nuts 11% and 15 engaging the studs anti elam nng the pin securely to thecross arm. The pin could as readily be secured to wooden cross arm, inwhich case a strap could be used or separate bolts passing through thecross arm could be used, or lag screws could be used. This manner of securing the pin admits of adjnstability of the pin along the arm. thisbeing impossible witi'i. the ordinary form of pin which is inserted in ah le formed in the cross arm when it is made The securing of the pin inthe above manner against the back face of the cross arm has also thedecided advantage that the vertical strain or pressure on the pin duringservice will be in a vertical plane substantially coincident with theplane of support of the cross arm on a pole. These cross arms areusually bolted against the face of the pole or are set into gains cut inthe .pole. In

the ordinary construction where pins are pplied in vertical holes in thecross arms, the

' Weight on the pins is in aplane off-set laterally from the plane ofsupport of the pole, that is. the pressure is in a plane outside of thegain and under heavy pressure the cross arm could twist. Where strapsare used in I connection with wooden cross arm the arm adapt it forreceiving an insulator or an insulator supporting thimble by weldingtogether the ends and forging them to form a cylindrical neck 16 and aconical shoulder section 17 at the base of the neck. The upper rivet'8holds the ends together securely preparatory tothe welding operation.During the forging operation the flange sections. it and i of thesections 7 and g are curled inwardly and the webs are worked until theconical shoulder section 17 results. This shoulder section can be madevery smooth and regular to adapt it particularly for intimate receptionof the conical skirt of an insulator thimble 18, the neck 16 beingthreaded to it the interior thread of the thimble. The end could ofcourse be welded and forged, and then threaded or otherwise treated toadapt it for receiving other forms of insulator supports, as for examplea thimble in the frrm of a wire helix.

In a pin formed up as described, the metal is distributed in accordancewith the strains to which the pin will be subjected. Ample metal isprovided at the shoulder 17 to resist strains and bending at this point,and the bends d and e just above the cross arm are gradual and make thepin very strong at this point. The sections 7 and 9 when securedtogether by the rivets will give great strength. The sections a and I)being separated by the gap 0 will afford ample seating base for the pinagainst its supporting arm.

I further- In short, a minimum amount of metal is distributed to givemaximum strength and efficiency, and the pin has greater strength withless weight than an ordinary cylindrical metal pin intended for the sameservice. The cost of manufacture and the expense of handling andshipping my improved pin is considerably reduced.

I do not desire to be limited to the exact structure and arrangementshown as changes are no doubt possible which would still come within thescope of the claims.

I claim as follows:

1. An integral metal insulator pin comprising two side members joinedattheir lower ends and spread apart for a distance upwardly to form flatvertical seating surfaces and to leave a passageway for bolts forsecuring the pin with one of said flat seating surfaces against asupport, the intermediate sections of saidside members bein rigidlysecured together and the upper ends of said side members being weldedinto a solid cylindrical neck threaded to receive insulators orinsulator supporting thimbles.

. 2. An integralmetal insulator pin comprising two side members joinedat their lower ends and spread apart for a distance upwardly to formflat vertical seating surfaces and to leave a passageway for bolts forsecuring the pin with one of said flat seating surfaces against asupport, the intermediate sections of said side members being rigidlysecured together and the upper ends of said side members being weldedinto a solid cylindrical neck threaded to receive insulators orinsulator supporting thimbles, and a long conical shoulder between saidneck and intermediate sections for intimately receiving the skirt ofinsulators or insulator supporting thimbles.

In witness whereof, I hereunto subscribe my name this 27 day of April,A. D., 1914.

CHARLES L. PEIRCE, JR.

Witnesses:

CHARLES J. SCHMIDT, S. B. CARR.

